diff --git a/test/typeparam/issue50109b.go b/test/typeparam/issue50109b.go
new file mode 100644
index 00000000000..1d89efca889
--- /dev/null
+++ b/test/typeparam/issue50109b.go
@@ -0,0 +1,29 @@
+// run -gcflags=-G=3
+
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func main() {
+	F[any]()
+}
+
+func F[T any]() I[T] {
+	return (*S1[T])(nil)
+}
+
+type I[T any] interface{}
+
+type S1[T any] struct {
+	*S2[T]
+}
+
+type S2[T any] struct {
+	S3 *S3[T]
+}
+
+type S3[T any] struct {
+	x int
+}